In plain English, is there a cheap solution to increase boost by a bit?
And how much can the boost be increased on a totally stock ST, without the ECU triggering all kinds of error codes?
If I can just install some valve (spring or other mod) of a few tens of dollars, without a tune, and gain even +1PSI extra without a tune, it would be worth it (I hope).
I understand running higher pressure can destroy the Turbo.
I'm barely ever taking my car over 4k RPM anyway.
I just love the turbo kicking in, when I surpass the 2.5k RPM. And usually pull it to 3.5-4k RPM before shifting. Occasionally 4.5k RPM.
I don't see myself changing that.
Adding a few PSI of boost, will hopefully add to the acceleration effect around that RPM range.